31144021669 has 2 divisors, whose sum is σ = 31144021670. Its totient is φ = 31144021668.

The previous prime is 31144021637. The next prime is 31144021681. The reversal of 31144021669 is 96612044113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26565740100 + 4578281569 = 162990^2 + 67663^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144021669 - 2⁵ = 31144021637 is a prime.

It is a super-2 number, since 2×31144021669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31144031669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572010834 + 15572010835.

It is an arithmetic number, because the mean of its divisors is an integer number (15572010835).

Almost surely, 2^31144021669 is an apocalyptic number.

It is an amenable number.

31144021669 is a deficient number, since it is larger than the sum of its proper divisors (1).

31144021669 is an equidigital number, since it uses as much as digits as its factorization.

31144021669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 31144021669 in words is "thirty-one billion, one hundred forty-four million, twenty-one thousand, six hundred sixty-nine".